communications from our studios in new york city, this is charlie rose. it is estimated that one in five american veterans in these wars suffer from severe depression or post traumatic stress disorder. retired lieutenant colonel john o blin is one of them. he served four tours in iraq and surrounding persian gulf as well as three tours on the-- tours on the border of israel and egypt, awarded the bronze star, purple heart and kbrat action badge among other commendationses. he joins me tonight to talk about his life, also joining me an extraordinary group of scien titss, mary stein from california san diego, lisa shin from tufts university, kerry russler from emory university, joann difede from cornell and my cohost is dr. eric kandel. a noubl lawyer yet, professor at columbia university and a howard hughes medical investigator. i am pleased to have all of them here this evening at this table. which begin as we always do talking to eric kandel. what are we doing this evening. >> post traumatic stress disorder. this is a fascinating disorder. and it is unique in psychiatry. it is perhaps the only p